Improvement in steam and hydraulic packing



Patented June11, 1878.

V'fnesss applied and compressed in position the surface UNITED STATESPATENT FFIGE.

CHARLES e. sYMoN IMPROVEMENT IN sTEA DS, OF PHILADELPHIA, PENNSY nvANIA.

M AND HYDRAULIC PACKING.

Specification forming part of Letters Patent No. 204,860, dated June 1l,1878; application filed Api-n e, 1ere.

To all whom it may concern:

Beit known that I, GHAnLEs S. C. SYMoNDs, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulImprovement in Steam and Hydraulic Packing, which improvement is fullyset forth in the following specification and accompanyin g drawings, inwhich- Figure l is a side elevation of packing` elnbodying my invention.Fig. 2 is a transverse section thereof. Fig. 3 is a similar section,showing the operation of the packing.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention consists of a packing having a rubber core of rectangularform, of unequal sides, and exterior fabric of concentric braids jointsbetween the same,

of elliptical form, so that when the packing is of the fabric willbecome quadrilateral, or nearly so, so as to present a iiush surface oncach side of the packing, and consequently produce close and tightjoints between the parts that are packed.

Referring to the drawings, A represents the exterior fabric or material,and B the core within the saine. This core is of the form of arectangular parallelogram in cross-section, and the fabric A is braidedin concentric endl less layers, or placed thereover, assuming anelliptical form, the several layers being coated with lubricant.

When the packing is applied and compressed in position, the long sidesof the core swell or expand, thus swelling or expanding the narrowdiameter of the fabric, and consequently of the packing, whereby, owingto the plates or parts of the cylinder, valve, &c., between which thepacking is confined and in contact, the packing becomes quadrilateral,or nearly so, in cross-section, as shown in Fig. 3, thus presenting asurface on each side which is flush with the respective plates or parts,and consequently producing close and tight it being noticed that thereare no crimps or breaks in the exterior surface of the packing.

Having thus described my invention, what 'l claim as new, and desire tosecure by Letters Patent, is-

An elliptical packing constructed of endless layers of fabric, a rubbercore of rectangular form, with unequal sides, and lubricant,substantially as and for the purpose set forth.

CHAS. S. C. SYMONDS.

Witnesses JOHN A. WrEDEnsHErr/r, J. M. K. Wrcxnnsnkn.

